configure: Fix build on debian by avoiding bashisms in the test command.
configure: Fix build on debian by avoiding bashisms in the test command.

sir-murray/weston,kwm81/weston,eyolfson/weston,Tarnyko/weston-xdg_surface_present,jonnylamb/weston,jonnylamb/weston,Fantu/compositor-spice,sir-murray/weston,xorgy/weston,udoprog/weston,Tarnyko/weston-xdg_surface_present,giucam/weston,Fantu/compositor-spice,mchalupa/weston,Fantu/compositor-spice,mchalupa/weston,krezovic/weston,giucam/weston,Gnurou/weston,eyolfson/weston,krezovic/weston,udoprog/weston,kwm81/weston,xorgy/weston,Gnurou/weston